Which event takes place during atrial diastole?
Blood fills the left ventricle and empties the right.
Both the left and right atrial chambers fill with blood.
Blood fills the right atrium and empties the left.
Both the left and right atria are emptied of blood.
The Correct Answer is B
A. Blood fills the left ventricle and empties the right: This refers to the ventricles, not the atria, so it is incorrect in the context of atrial diastole.
B. Both the left and right atrial chambers fill with blood: During atrial diastole, the atria relax and fill with blood from the veins (superior/inferior vena cava for the right atrium and pulmonary veins for the left atrium).
C. Blood fills the right atrium and empties the left: This is incorrect because both atria fill with blood during atrial diastole.
D. Both the left and right atria are emptied of blood: This describes atrial systole (contraction), not diastole.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Producing early induced proteins: While natural killer cells can produce cytokines, their primary function is not related to protein production.
B. Promoting opsonization of bacteria cells: Opsonization is primarily performed by antibodies and complement proteins, rather than natural killer cells.
C. Secreting signaling molecules: While natural killer cells do secrete signaling molecules (cytokines) to communicate with other immune cells, their main role is the direct destruction of infected cells.
D. Destroying virally infected cells: The primary function of natural killer cells is to recognize and eliminate virally infected cells and tumor cells, contributing to the innate immune response.
Correct Answer is A
Explanation
A. Fibroblasts: Fibroblasts are responsible for synthesizing the extracellular matrix and collagen, which are essential for tissue repair and healing after an injury.
B. Complement cells: Incorrect. Complement cells are part of the immune response that helps to mark pathogens for destruction, but they do not proliferate during tissue repair.
C. Prostaglandins: Incorrect. Prostaglandins are lipid compounds that play a role in inflammation and pain but are not cells and do not proliferate.
D. Leukotrienes: Incorrect. Leukotrienes are inflammatory mediators involved in the immune response but do not proliferate during tissue repair.
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